2004 Chevrolet Trailblazer Q&A
2004 Chevrolet Trailblazer Question: Code p2101, p2176, p1516, this are the codes what are they?
all codes pertain to throttle position issues. best you seek daig and est from your mech. there is a test procedure to follow to determine which sensor is bad. - globalhelper
All the codes relate to sensor values being out of range concerning electronic throttle control system. This should be diagnosed by a technician. - milesauto